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APPENDIX A
A
-11
Port Label
Connector
Type
I/O Signal Remarks
Log
signal
200 pulse/nm or 400 pulse/nm (software), 0.5 A max.
LOG/ALARM MJ7 O
HDG
alarm
Heading alarm, 0.5 A max, normal close
HDG IN MJ6 I Heading
Heading data in either AD10 or IEC 61162 (NMEA
0183) format (4800 bps) is automatically received.
Priority of IEC 61162 (NMEA 0183) sentence is
HDT>HDG>HDM.
The signal is selected through the menu during the
period of internal heading sensor failure.
VBW/VHW/VLM may be input from a current indicator.
Note: Each GPS receiver GPS1, GPS2, and GPS3 calculates VTG/GGA/GLL/ZDA. The
output from HDG OUT and NAV OUT ports is one calculated by the GPS1. However,
when the GPS1 is defective, the GPS2 replaces it. When both GPS1 and GPS2 are
defective, the data calculated by the GPS3 is used.
Parts Location
PWR Board
20P8164
MAIN Board (processor)
20P8171A
Angular Rate
Sensor Assy.
SC-303
GPS Receiver
Assy. (GPS
Receiver Module)
20-513-131
(GN-77NA-NF)
FIL Board
20P8165
Fuse
Processor unit, cover removed